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About Gran Compe GC450 ??

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About Gran Compe GC450 ??

Old 11-23-19, 03:18 AM
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brooklyn6640 
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About Gran Compe GC450 ??

Found this link about the 450 .
it seems that many have had problems with
https://forum.cyclinguk.org/viewtopic.php?t=76395

?? :
Zeus 2000 vs GC450 ???

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Old 11-23-19, 07:03 PM
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What kind of problems? Those due to the basic twin pivot center pull design or those due to the bearinged pivots? Other? The few that I have serviced over the years have no specifically negative memories left in my memory banks. Andy
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Old 11-23-19, 07:17 PM
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Originally Posted by brooklyn6640 View Post
Found this link about the 450 .
it seems that many have had problems with
https://forum.cyclinguk.org/viewtopic.php?t=76395

?? :
Zeus 2000 vs GC450 ???
Spam to drive clicks?
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Old 11-24-19, 10:46 AM
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Originally Posted by Andrew R Stewart View Post
What kind of problems? Those due to the basic twin pivot center pull design or those due to the bearinged pivots? Other? The few that I have serviced over the years have no specifically negative memories left in my memory banks. Andy
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Old 11-24-19, 11:52 AM
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brooklyn6640-

I had GC 450s on braze on mounts on a frameset and I do not recall issues with noise on the OEM brake pads. I didn't use them for an extended period nor under extreme conditions. They are one of the most beautiful brakesets ever made but keep in mind the following: 1. the braze on pivot posts are a unique diameter due to the ball bearing pivots; 2. no other Weinmann/Dia Compe braze-on post will work with the 450's arms; 3. No other Weinmann / Dia Compe centerpull brake arms will fit the 450 pivots; 4. the brake shoe posts are 1 mm different in diameter than normal, smooth posts and do not accept Mafac or any other post; 5. I believe the shoe/pad configuration is unique and I know of no direct replacement pad (I looked back then) and 6. the very small diameter straddle cable ends will weld themselves into the brake arm end holes unless you lube them on assembly, especially in a corroding environment. When you commit to GC 450s or their longer reach cousins, you commit totally and forever barring complete replacement of the brake caliper/pivot assembly.
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Old 11-24-19, 12:55 PM
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Originally Posted by bertinjim View Post
brooklyn6640-

I had GC 450s on braze on mounts on a frameset and I do not recall issues with noise on the OEM brake pads. I didn't use them for an extended period nor under extreme conditions. They are one of the most beautiful brakesets ever made but keep in mind the following: 1. the braze on pivot posts are a unique diameter due to the ball bearing pivots; 2. no other Weinmann/Dia Compe braze-on post will work with the 450's arms; 3. No other Weinmann / Dia Compe centerpull brake arms will fit the 450 pivots; 4. the brake shoe posts are 1 mm different in diameter than normal, smooth posts and do not accept Mafac or any other post; 5. I believe the shoe/pad configuration is unique and I know of no direct replacement pad (I looked back then) and 6. the very small diameter straddle cable ends will weld themselves into the brake arm end holes unless you lube them on assembly, especially in a corroding environment. When you commit to GC 450s or their longer reach cousins, you commit totally and forever barring complete replacement of the brake caliper/pivot assembly.
Hi You talk about this vertion:?
https://www.ebay.com/itm/Dia-Compe-G...ePsMvT-lp-nU_g
the pad holder and brakes pas seem to be like shimano model.
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Old 11-24-19, 03:25 PM
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brooklyn6640-

Your link looks to be a newer, reissued version of the brakeset. My experience is with the older, 1980s version shown here:





The ad you referenced is a newer version which looks similar but may be different in details like brake post diameter and brake pad size.
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